Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.

Patents

  1. Advanced Patent Search
Publication numberUS4810834 A
Publication typeGrant
Application numberUS 07/122,774
Publication dateMar 7, 1989
Filing dateNov 19, 1987
Priority dateNov 20, 1986
Fee statusLapsed
Also published asDE3639703A1, EP0268286A2, EP0268286A3
Publication number07122774, 122774, US 4810834 A, US 4810834A, US-A-4810834, US4810834 A, US4810834A
InventorsFerdinand Grogl, Wolfgang Schmidt
Original AssigneeAlcatel N.V.
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Tensionproof cable
US 4810834 A
Abstract
The disclosed communications cables have tensionproof jackets which consist of tensionproof and axial-compression-resistant tape and an outer plastic covering extruded over the tape. The tape includes lengthwise threads of aramid or glass, lengthwise threads of aramid- or glass-fiber-reinforced plastic or a liquid-crystal polymer, and cross threads of a different plastic material. It may be designed as a open-mesh tape. The tape has a longitudinal seam which may deviate in alternating direction from the longitudinal axis of the cable by a small angle to improve flexibility.
Images(2)
Previous page
Next page
Claims(6)
What is claimed is:
1. A communications cable assembly comprising a cable core;
a tensionproof and axial-compression-resistant tape encircling said core and having a longitudinal butt seam extending in the axial direction of the cable assembly, said tape comprising a plurality of tensionproof and axial-compression-resistant straight threads extending in the longitudinal direction of the tape, said threads being made from the group consisting of glass-fiber-reinforced plastics, aramid-fiber-reinforced plastics, liquid-crystal polymers, glass-fiber-reinforced liquid-crystal polymers, and aramid-fiber-reinforced liquid-crystal polymers; and
a plastic covering extruded over said tape, wherein said threads remain straight and will absorb any applied tensile forces despite any tendency for the extruded covering to shrink.
2. A cable as claimed in claim 1, wherein said tape is open-mesh.
3. A cable as claimed in claim 1, wherein said tape has practically no gaps between its lengthwise threads.
4. A cable as claimed in claim 1, wherein said longitudinally extending seam deviates from the cable axis at a small angle of alternating sign.
5. A cable as claimed in claim 4, wherein said angle is less than 10.
6. A cable as claimed in claim 5, wherein said angle is between 1 and 5.
Description
TECHNICAL FIELD

The present invention relates to a cable with a tensionproof communications cable jacket.

BACKGROUND ART

An exemplary prior art cable with a tensionproof cable jacket is disclosed in published German patent application DE-OS 34 14 638. It contains a tensionproof open-mesh tape which consists of longitudinal aramid threads and cross threads of another plastic, and over which an outer plastic covering is extruded. When the latter shrinks, the tensionproof tape becomes wavy, so that subsequently applied tensile forces will not be absorbed by the tape until the latter has been completely straightened.

DISCLOSURE OF INVENTION

The present invention provides an improved tensionproof cable having a nonshrinkable, tensionproof cable jacket.

To that end, the tensionproof tape contains tensionproof and axial-compression-resistant lengthwise threads of glass- or aramid-fiber-reinforced plastic, a liquid-crystal polymer, or a glass- or aramid-fiber-reinforced liquid-crystal polymer.

In accordance with presently preferred embodiments, the tensionproof element encircles the central core of the cable and is formed from a longitudinally extending open-mesh tape or a tape having practically no gaps between the lengthwise threads; a longitudinal butt seam of the tape may deviate from the cable axis at a small angle, with the deviation alternating in direction. The novel cable can be manufactured easily and at low cost. In the case of cables in which the jacket construction is not stable against axial compression, such as indoor cables, axial-compression resistance is increased without appreciably reducing flexibility. As high-tensile-strength and axial-compression-resistant elements are combined in one tape, overhead cables, in particular, can be manufactured with high tensile strength and small diameter, i.e., in a weight-saving manner, which results in a great maximum span length.

BRIEF DESCRIPTION OF DRAWINGS

In the accompanying drawing,

FIG. 1 (comprising longitudinal cutaway view 1a and cross-sectional view 1b) shows schematically the construction and a cross-section of a first embodiment having an open-mesh tape;

FIG. 2 (comprising longitudinal cutaway view 2a and cross-sectional view 2b) shows schematically the construction and a cross-section of a second embodiment having another type of tape.; and

FIG. 3 shows schematically the construction of a third embodiment in which the longitudinal seam of the tape deviates from the longitudinal axis of the cable by a small amount.

BEST MODE FOR CARRYING OUT THE INVENTION

The invention will now be explained with reference to the two presently preferred embodiments shown in the drawings. Alternative embodiments will also be noted.

The cable of FIG. 1 contains a cable core 1 of a conventional construction familiar to those skilled in the art. Encircling the cable core with a longitudinal butt seam is an open-mesh tape 2 consisting of parallel lengthwise threads 3, 4 and cross threads 5. A portion 3 of the lengthwise threads may be tensionproof aramid or glass threads, the remaining portion 4 are tensionproof and axial-compression-resistant threads of aramid- or glass-fiber-reinforced plastic (such as LLS-045 of Neptco, USA), a liquid-crystal polymer (such as Vektra B900 of Celanese), or an aramid- or glass-fiber-reinforced liquid-crystal polymer. The cross threads 5 are made of any suitable plastic. Extruded over the tape is an outer plastic covering 6 which embeds the threads of the open-mesh tape or fuses with the cross threads 5 if the material of the latter is the same as that of the outer plastic covering 6.

As shown in FIG. 2, the cable core 1' is of the type known as "loose tube single fiber" (alternatively, it may be of the type "loose tube multiple fiber"); encasing the cable core is a tape 2' consisting of parallel lengthwise threads 3', 4' and cross threads 5'. The tape 2' is of the same construction as the open-mesh tape 2 except that it has no gaps between the lengthwise threads 3', 4'. An outer plastic covering 6' is applied over this tape.

It is to be noted that, as shown in FIG. 3, the tapes 2, 2' may be placed around the cable core 1, 1' at a small angle (greater than 0 and less than 10 and preferably between 1 and 5) to the cable's axis to as to produce a helical longitudinal seam which, after the helix has completed about half a turn, reverses in direction. Such an alternating helical construction has a greater flexibility without any significant reduction in tensile strength and axial-compression resistance.

The present invention has been described above with regard to the certain presently contemplated specific embodiments of the invention. It will be appreciated to those skilled in the art that modifications and variations thereof are possible within the spirit and scope of the appended claims.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US3903354 *Mar 8, 1974Sep 2, 1975Aeg Telefunken KabelwerkeCable with high tensile strength sheathing
US4197423 *Jun 24, 1977Apr 8, 1980Felten & Guilleaume Carlswerk AktiengesellschaftSubmersible cable for fish-repelling installation
US4312260 *Sep 10, 1979Jan 26, 1982Rhone-Poulenc-TextileFlexible cable
US4710594 *Jun 23, 1986Dec 1, 1987Northern Telecom LimitedTelecommunications cable
DE3414638A1 *Apr 18, 1984Oct 24, 1985Standard Elektrik Lorenz AgTension-resistant cable
GB244944A * Title not available
GB266855A * Title not available
GB830644A * Title not available
JP13001791A * Title not available
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US5593524 *Nov 14, 1994Jan 14, 1997Philips; Peter A.Electrical cable reinforced with a longitudinally applied tape
US5817982 *Apr 26, 1996Oct 6, 1998Owens-Corning Fiberglas Technology Inc.Nonlinear dielectric/glass insulated electrical cable and method for making
US5882741 *Jan 26, 1996Mar 16, 1999Foster-Miller, Inc.Members having a multiaxially oriented coating of thermotropic liquid crystalline polymer and method and apparatus for producing such members
US6064007 *Apr 29, 1996May 16, 2000Electric Power Research Institute Inc.Moisture resistant underground cable
US6509521 *Nov 10, 2000Jan 21, 2003Scimed Life Systems, Inc.X-ray catheter with coaxial conductor
US6540655Nov 10, 2000Apr 1, 2003Scimed Life Systems, Inc.Miniature x-ray unit
US6706014Feb 14, 2003Mar 16, 2004Scimed Life Systems, Inc.Miniature x-ray unit
US6752752Feb 14, 2003Jun 22, 2004Scimed Life Systems, Inc.Multi-source x-ray catheter
US6999559Feb 14, 2003Feb 14, 2006Scimed Life Systems, Inc.Heat sink for miniature x-ray unit
US7031432Feb 6, 2003Apr 18, 2006Scimed Life Systems, Inc.Miniature x-ray catheter with retractable needles or suction means for positioning at a desired site
US7379642Jan 18, 2005May 27, 2008Adc Telecommunications, Inc.Low shrink telecommunications cable and methods for manufacturing the same
US7566474May 5, 2008Jul 28, 2009Adc Telecommunications, Inc.Constructed to resist post-extrusion shrinkage; liquid crystal polymers
US7869677Jun 26, 2009Jan 11, 2011Adc Telecommunications, Inc.Low shrink telecommunications cable and methods for manufacturing the same
US7901345Jul 1, 2010Mar 8, 2011Boston Scientific Scimed, IncMiniature X-ray unit
US8090232Jan 10, 2011Jan 3, 2012Adc Telecommunications, Inc.Low shrink telecommunications cable and methods for manufacturing the same
US8107781Nov 19, 2010Jan 31, 2012Adc Telecommunications, Inc.Fiber optic cable
US8326104Dec 21, 2011Dec 4, 2012Adc Telecommunications, Inc.Low shrink telecommunications cable and methods for manufacturing the same
US8391658May 27, 2009Mar 5, 2013Adc Telecommunications, Inc.Fiber optic cable with jacket embedded with reinforcing members
US8548293May 28, 2009Oct 1, 2013Adc Telecommunications, Inc.Fiber optic cable
US8781281Jul 23, 2012Jul 15, 2014Adc Telecommunications, Inc.Drop cable with angled reinforcing member configurations
USH1502 *Aug 17, 1993Nov 7, 1995Fiberweb North America, Inc.Meltblown fibers and webs produced from liquid crystal polymers
Classifications
U.S. Classification174/121.00R, 174/121.0SR
International ClassificationH01B7/18, G02B6/44
Cooperative ClassificationH01B7/183
European ClassificationH01B7/18B4
Legal Events
DateCodeEventDescription
May 8, 2001FPExpired due to failure to pay maintenance fee
Effective date: 20010307
Mar 4, 2001LAPSLapse for failure to pay maintenance fees
Sep 26, 2000REMIMaintenance fee reminder mailed
Aug 22, 1996FPAYFee payment
Year of fee payment: 8
Sep 8, 1992FPAYFee payment
Year of fee payment: 4
Jan 22, 1988ASAssignment
Owner name: ALCATEL, N.V., DE LAIRESSENSTRAAT 153, 1075 HK, AM
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNORS:GROGL, FERDINAND;SCHMIDT, WOLFGANG;REEL/FRAME:004857/0356
Effective date: 19880113
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:GROGL, FERDINAND;SCHMIDT, WOLFGANG;REEL/FRAME:4857/356
Owner name: ALCATEL, N.V.,NETHERLANDS
Owner name: ALCATEL, N.V., NETHERLANDS
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:GROGL, FERDINAND;SCHMIDT, WOLFGANG;REEL/FRAME:004857/0356